// 驱动服务实现

use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use crate::ipc_service::{self, IpcMessage};
use crate::config::SystemConfig;

// FFI绑定到exokernel驱动API
#[link(name = "exokernel")]
extern "C" {
    // 能力ID类型
    type CapabilityId = u64;
    type PhysicalAddress = u64;
    type VirtualAddress = u64;
    
    // 驱动相关API
    fn exokernel_driver_manager_init(
        memory_manager_ptr: *mut u8,
        capability_manager_ptr: *mut u8,
        trap_handler_ptr: *mut u8
    ) -> bool;
    
    fn exokernel_driver_manager_deinit() -> ();
    
    fn exokernel_driver_load(
        driver_ptr: *mut u8
    ) -> bool;
    
    fn exokernel_driver_unload(
        driver_ptr: *mut u8
    ) -> bool;
    
    fn exokernel_device_register(
        device_info_ptr: *mut u8
    ) -> u64;
    
    fn exokernel_device_remove(
        device_id: u64
    ) -> ();
    
    fn exokernel_device_ioctl(
        device_id: u64,
        cmd: u32,
        data_ptr: *mut u8,
        size: u64
    ) -> isize;
    
    fn exokernel_driver_register_irq_handler(
        cap_id: CapabilityId,
        irq: u32,
        handler: u64
    ) -> bool;
    
    fn exokernel_driver_unregister_irq_handler(
        cap_id: CapabilityId,
        irq: u32
    ) -> bool;
    
    fn exokernel_driver_send_eoi(
        cap_id: CapabilityId,
        irq: u32
    ) -> ();
}

// 总线类型枚举
#[derive(PartialEq)]
#[repr(u8)]
pub enum BusType {
    Unknown = 0,
    Pci = 1,
    Usb = 2,
    I2c = 3,
    Spi = 4,
    Isa = 5,
    Acpi = 6,
    Npu = 7, // 神经处理单元总线类型
    Tpu = 8,
    Dpu = 9,
    Bpu = 10,
}

// 设备状态枚举
#[repr(u8)]
pub enum DeviceState {
    Unknown = 0,
    Disconnected = 1,
    Connected = 2,
    Initialized = 3,
    Suspended = 4,
    Error = 5,
    Busy = 6, // 设备忙碌状态，适用于NPU等计算设备
}

// 设备信息结构
#[repr(C)]
pub struct DeviceInfo {
    pub id: u64,
    vendor_id: u32,
    device_id: u32,
    class_id: u32,
    subclass_id: u32,
    prog_if: u32,
    bus_type: BusType,
    bus_info: *mut u8,
}

// 手动实现Send和Sync以确保线程安全
unsafe impl Send for DeviceInfo {}
unsafe impl Sync for DeviceInfo {}

// 驱动接口结构
#[repr(C)]
pub struct DriverInterface {
    name: *const u8,
    description: *const u8,
    version: u32,
    init: extern "C" fn(*mut u8, *mut *mut u8) -> bool,
    deinit: extern "C" fn(*mut u8) -> (),
    probe: extern "C" fn(*mut DeviceInfo) -> bool,
    remove: extern "C" fn(u64) -> (),
    ioctl: extern "C" fn(u64, u32, *mut u8, u64) -> isize,
}

// 驱动服务结构
pub struct DriverService {
    loaded_drivers: HashMap<String, *mut DriverInterface>,
    registered_devices: HashMap<u64, DeviceInfo>,
    driver_cap: u64,
    // NPU特定的状态和资源管理
    npu_devices: HashMap<u64, NpuDeviceState>,
    // TPU设备特定状态
    tpu_devices: HashMap<u64, TpuDeviceState>,
    // DPU设备特定状态
    dpu_devices: HashMap<u64, DpuDeviceState>,
    // BPU设备特定状态
    bpu_devices: HashMap<u64, BpuDeviceState>,
}

// NPU设备状态结构
pub struct NpuDeviceState {
    pub is_busy: bool,
    pub loaded_models: u32,
    pub memory_usage: u64,
    pub temperature: u32,
    pub power_mode: u8, // 0: 省电, 1: 平衡, 2: 高性能
}

// TPU设备状态结构
pub struct TpuDeviceState {
    pub is_busy: bool,
    pub loaded_models: u64,
    pub memory_usage: u64,
    pub temperature: u32,
    pub power_mode: u8,
    pub active_cores: u32,
}

// DPU设备状态结构
pub struct DpuDeviceState {
    pub is_busy: bool,
    pub loaded_programs: u64,
    pub memory_usage: u64,
    pub temperature: u32,
    pub power_mode: u8,
    pub bandwidth: u64,
    pub queue_depth: u32,
}

// BPU设备状态结构
pub struct BpuDeviceState {
    pub is_busy: bool,
    pub loaded_networks: u64,
    pub memory_usage: u64,
    pub temperature: u32,
    pub power_mode: u8,
    pub neuron_usage: u32,
    pub synapse_usage: u32,
}

impl DriverService {
    pub fn new(driver_cap: u64) -> Result<Self, String> {
        // 在实际系统中，这里会获取exokernel的内存管理器、能力管理器和陷阱处理器的指针
        // 这里为了示例简化，使用null指针
        unsafe {
            if !exokernel_driver_manager_init(std::ptr::null_mut(), std::ptr::null_mut(), std::ptr::null_mut()) {
                return Err("Failed to initialize driver manager".to_string());
            }
        }
        
        Ok(Self {
            loaded_drivers: HashMap::new(),
            registered_devices: HashMap::new(),
            driver_cap,
            npu_devices: HashMap::new(),
            tpu_devices: HashMap::new(),
            dpu_devices: HashMap::new(),
            bpu_devices: HashMap::new(),
        })
    }

    // 启动驱动服务
    pub fn start(&self) -> Result<(), String> {
        // 在实际实现中，这里会初始化各种总线控制器和扫描设备
        // 这里为了示例简化，只打印信息
        log::info!("Driver service started");
        
        // 扫描系统中的设备（简化实现）
        self.scan_devices()?;
        
        // 尝试加载系统配置中指定的驱动
        self.load_configured_drivers()?;
        
        Ok(())
    }
    
    // 扫描设备
    fn scan_devices(&self) -> Result<(), String> {
        // 在实际实现中，这里会扫描PCIe、USB等总线上的设备
        log::info!("Scanning for devices...");
        // 这里只是示例，实际实现需要调用exokernel的API来扫描设备
        Ok(())
    }
    
    // 加载配置的驱动
    fn load_configured_drivers(&self) -> Result<(), String> {
        // 在实际实现中，这里会从系统配置中读取需要加载的驱动列表
        log::info!("Loading configured drivers...");
        // 这里只是示例，实际实现需要读取配置并加载驱动
        Ok(())
    }

    // 清理驱动服务
    pub fn deinit(&mut self) {
        // 卸载所有驱动
        for (_, driver) in self.loaded_drivers.iter() {
            self.unload_driver(driver);
        }
        self.loaded_drivers.clear();
        self.registered_devices.clear();

        // 清理exokernel驱动管理器
        unsafe {
            exokernel_driver_manager_deinit();
        }
    }

    // 加载驱动
    pub fn load_driver(&mut self, driver: *mut DriverInterface) -> bool {
        // 检查驱动是否已加载
        let driver_name = unsafe { std::ffi::CStr::from_ptr(driver.name as *const i8).to_string_lossy().to_string() };
        if self.loaded_drivers.contains_key(&driver_name) {
            return false;
        }

        // 加载驱动到exokernel
        let result = unsafe {
            exokernel_driver_load(driver)
        };

        if result {
            self.loaded_drivers.insert(driver_name, driver);
        }

        return result;
    }

    // 卸载驱动
    pub fn unload_driver(&mut self, driver: *mut DriverInterface) -> bool {
        // 获取驱动名称
        let driver_name = unsafe { std::ffi::CStr::from_ptr(driver.name as *const i8).to_string_lossy().to_string() };

        // 检查驱动是否已加载
        if !self.loaded_drivers.contains_key(&driver_name) {
            return false;
        }

        // 从exokernel卸载驱动
        let result = unsafe {
            exokernel_driver_unload(driver)
        };

        if result {
            self.loaded_drivers.remove(&driver_name);
        }

        return result;
    }

    // 注册设备
    pub fn register_device(&mut self, device_info: &mut DeviceInfo) -> u64 {
        // 注册设备到exokernel
        let device_id = unsafe {
            exokernel_device_register(device_info as *mut DeviceInfo as *mut u8)
        };

        if device_id != 0 {
            self.registered_devices.insert(device_id, *device_info);
            
            // 根据设备类型初始化特定状态
            if device_info.bus_type == BusType::Npu || 
               (device_info.class_id >= 0x080000 && device_info.class_id <= 0x08FFFF) {
                self.npu_devices.insert(device_id, NpuDeviceState {
                    is_busy: false,
                    loaded_models: 0,
                    memory_usage: 0,
                    temperature: 0,
                    power_mode: 1, // 默认平衡模式
                });
            }
            // TPU设备
            else if device_info.bus_type == BusType::Tpu || 
                    (device_info.class_id >= 0x090000 && device_info.class_id <= 0x09FFFF) {
                self.tpu_devices.insert(device_id, TpuDeviceState {
                    is_busy: false,
                    loaded_models: 0,
                    memory_usage: 0,
                    temperature: 0,
                    power_mode: 1, // 默认平衡模式
                    active_cores: 0,
                });
            }
            // DPU设备
            else if device_info.bus_type == BusType::Dpu || 
                    (device_info.class_id >= 0x0A0000 && device_info.class_id <= 0x0AFFFF) {
                self.dpu_devices.insert(device_id, DpuDeviceState {
                    is_busy: false,
                    loaded_programs: 0,
                    memory_usage: 0,
                    temperature: 0,
                    power_mode: 1, // 默认平衡模式
                    bandwidth: 0,
                    queue_depth: 0,
                });
            }
            // BPU设备
            else if device_info.bus_type == BusType::Bpu || 
                    (device_info.class_id >= 0x0B0000 && device_info.class_id <= 0x0BFFFF) {
                self.bpu_devices.insert(device_id, BpuDeviceState {
                    is_busy: false,
                    loaded_networks: 0,
                    memory_usage: 0,
                    temperature: 0,
                    power_mode: 1, // 默认平衡模式
                    neuron_usage: 0,
                    synapse_usage: 0,
                });
            }
        }

        return device_id;
    }

    // 移除设备
    pub fn remove_device(&mut self, device_id: u64) {
        // 从exokernel移除设备
        unsafe {
            exokernel_device_remove(device_id);
        }

        // 从本地设备列表中移除
        self.registered_devices.remove(&device_id);
        
        // 从各种处理单元设备列表中移除
        self.npu_devices.remove(&device_id);
        self.tpu_devices.remove(&device_id);
        self.dpu_devices.remove(&device_id);
        self.bpu_devices.remove(&device_id);
    }

    // 设备控制
    pub fn ioctl(&self, device_id: u64, cmd: u32, data: *mut u8, size: u64) -> isize {
        // 检查设备是否存在
        if !self.registered_devices.contains_key(&device_id) {
            return -1;
        }

        // 向设备发送控制命令
        unsafe {
            exokernel_device_ioctl(device_id, cmd, data, size)
        }
    }

    // 处理IPC消息
    pub fn handle_ipc_message(&mut self, msg: IpcMessage) -> Result<Vec<u8>, String> {
        match msg.msg_type {
            // 加载驱动
            1 => {
                // 在实际实现中，这里会从消息数据中解析驱动指针
                let driver_ptr = msg.data.as_ptr() as *mut DriverInterface;
                let result = self.load_driver(driver_ptr);
                Ok(vec![result as u8])
            },
            
            // 卸载驱动
            2 => {
                // 在实际实现中，这里会从消息数据中解析驱动指针
                let driver_ptr = msg.data.as_ptr() as *mut DriverInterface;
                let result = self.unload_driver(driver_ptr);
                Ok(vec![result as u8])
            },
            
            // 注册设备
            3 => {
                // 在实际实现中，这里会从消息数据中解析设备信息
                let device_info_ptr = msg.data.as_ptr() as *mut DeviceInfo;
                let device_id = self.register_device(device_info_ptr);
                Ok(device_id.to_le_bytes().to_vec())
            },
            
            // 移除设备
            4 => {
                // 在实际实现中，这里会从消息数据中解析设备ID
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                self.remove_device(device_id);
                Ok(vec![1])
            },
            
            // 设备控制
            5 => {
                // 在实际实现中，这里会从消息数据中解析设备ID、命令、数据和大小
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                let cmd = u32::from_le_bytes(
                    msg.data[8..12].try_into().map_err(|_| "Invalid command".to_string())?
                );
                let size = u64::from_le_bytes(
                    msg.data[12..20].try_into().map_err(|_| "Invalid size".to_string())?
                );
                let data_ptr = msg.data[20..].as_ptr() as *mut u8;
                
                let result = self.ioctl(device_id, cmd, data_ptr, size);
                Ok(result.to_le_bytes().to_vec())
            },
            
            // NPU特定命令 - 获取设备状态
            6 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                
                if let Some(npu_state) = self.npu_devices.get(&device_id) {
                    // 将NPU状态序列化为字节数组返回
                    let mut result = Vec::new();
                    result.extend(&npu_state.is_busy.to_le_bytes());
                    result.extend(&npu_state.loaded_models.to_le_bytes());
                    result.extend(&npu_state.memory_usage.to_le_bytes());
                    result.extend(&npu_state.temperature.to_le_bytes());
                    result.extend(&npu_state.power_mode.to_le_bytes());
                    Ok(result)
                } else {
                    Err("Not an NPU device".to_string())
                }
            },
            
            // NPU特定命令 - 设置电源模式
            7 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                let power_mode = msg.data[8];
                
                if let Some(npu_state) = self.npu_devices.get_mut(&device_id) {
                    npu_state.power_mode = power_mode;
                    Ok(vec![1])
                } else {
                    Err("Not an NPU device".to_string())
                }
            },
            
            // TPU特定命令 - 获取设备状态
            8 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                
                if let Some(tpu_state) = self.tpu_devices.get(&device_id) {
                    // 将TPU状态序列化为字节数组返回
                    let mut result = Vec::new();
                    result.extend(&tpu_state.is_busy.to_le_bytes());
                    result.extend(&tpu_state.loaded_models.to_le_bytes());
                    result.extend(&tpu_state.memory_usage.to_le_bytes());
                    result.extend(&tpu_state.temperature.to_le_bytes());
                    result.extend(&tpu_state.power_mode.to_le_bytes());
                    result.extend(&tpu_state.active_cores.to_le_bytes());
                    Ok(result)
                } else {
                    Err("Not a TPU device".to_string())
                }
            },
            
            // TPU特定命令 - 设置电源模式
            9 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                let power_mode = msg.data[8];
                
                if let Some(tpu_state) = self.tpu_devices.get_mut(&device_id) {
                    tpu_state.power_mode = power_mode;
                    Ok(vec![1])
                } else {
                    Err("Not a TPU device".to_string())
                }
            },
            
            // DPU特定命令 - 获取设备状态
            10 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                
                if let Some(dpu_state) = self.dpu_devices.get(&device_id) {
                    // 将DPU状态序列化为字节数组返回
                    let mut result = Vec::new();
                    result.extend(&dpu_state.is_busy.to_le_bytes());
                    result.extend(&dpu_state.loaded_programs.to_le_bytes());
                    result.extend(&dpu_state.memory_usage.to_le_bytes());
                    result.extend(&dpu_state.temperature.to_le_bytes());
                    result.extend(&dpu_state.power_mode.to_le_bytes());
                    result.extend(&dpu_state.bandwidth.to_le_bytes());
                    result.extend(&dpu_state.queue_depth.to_le_bytes());
                    Ok(result)
                } else {
                    Err("Not a DPU device".to_string())
                }
            },
            
            // DPU特定命令 - 设置电源模式
            11 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                let power_mode = msg.data[8];
                
                if let Some(dpu_state) = self.dpu_devices.get_mut(&device_id) {
                    dpu_state.power_mode = power_mode;
                    Ok(vec![1])
                } else {
                    Err("Not a DPU device".to_string())
                }
            },
            
            // BPU特定命令 - 获取设备状态
            12 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                
                if let Some(bpu_state) = self.bpu_devices.get(&device_id) {
                    // 将BPU状态序列化为字节数组返回
                    let mut result = Vec::new();
                    result.extend(&bpu_state.is_busy.to_le_bytes());
                    result.extend(&bpu_state.loaded_networks.to_le_bytes());
                    result.extend(&bpu_state.memory_usage.to_le_bytes());
                    result.extend(&bpu_state.temperature.to_le_bytes());
                    result.extend(&bpu_state.power_mode.to_le_bytes());
                    result.extend(&bpu_state.neuron_usage.to_le_bytes());
                    result.extend(&bpu_state.synapse_usage.to_le_bytes());
                    Ok(result)
                } else {
                    Err("Not a BPU device".to_string())
                }
            },
            
            // BPU特定命令 - 设置电源模式
            13 => {
                let device_id = u64::from_le_bytes(
                    msg.data[0..8].try_into().map_err(|_| "Invalid device ID".to_string())?
                );
                let power_mode = msg.data[8];
                
                if let Some(bpu_state) = self.bpu_devices.get_mut(&device_id) {
                    bpu_state.power_mode = power_mode;
                    Ok(vec![1])
                } else {
                    Err("Not a BPU device".to_string())
                }
            },
            
            // 未知消息类型
            _ => {
                Err("Unknown message type".to_string())
            }
        }
    }
}

// 驱动适配层支持
// 这个模块用于支持Linux和ReactOS驱动的移植

// Linux驱动适配层
pub mod linux_driver_adapter {
    use super::*;
    
    // Linux驱动结构
    pub struct LinuxDriver {
        name: String,
        description: String,
        version: u32,
        // 其他Linux驱动相关字段
    }
    
    impl LinuxDriver {
        // 创建Linux驱动
        pub fn new(name: &str, description: &str, version: u32) -> Self {
            Self {
                name: name.to_string(),
                description: description.to_string(),
                version: version,
            }
        }
        
        // 转换为DriverInterface
        pub fn to_driver_interface(&self) -> DriverInterface {
            // 在实际实现中，这里会实现Linux驱动的回调函数
            // 这里为了示例简化，使用null指针
            unsafe {
                std::mem::zeroed()
            }
        }
    }
}

// ReactOS驱动适配层
pub mod reactos_driver_adapter {
    use super::*;
    
    // ReactOS驱动结构
    pub struct ReactosDriver {
        name: String,
        description: String,
        version: u32,
        // 其他ReactOS驱动相关字段
    }
    
    impl ReactosDriver {
        // 创建ReactOS驱动
        pub fn new(name: &str, description: &str, version: u32) -> Self {
            Self {
                name: name.to_string(),
                description: description.to_string(),
                version: version,
            }
        }
        
        // 转换为DriverInterface
        pub fn to_driver_interface(&self) -> DriverInterface {
            // 在实际实现中，这里会实现ReactOS驱动的回调函数
            // 这里为了示例简化，使用null指针
            unsafe {
                std::mem::zeroed()
            }
        }
    }
}